TY - JOUR A2 - Clemente, Rafael AU - Kunito, Takashi AU - Shiroma, Takashi AU - Moro, Hitoshi AU - Sumi, Hirotaka PY - 2018 DA - 2018/10/10 TI - Annual Variation in Soil Enzyme Activity in a Paddy Field: Soil Temperature and Nutrient Availability Are Important for Controlling Enzyme Activities SP - 4093219 VL - 2018 AB - Annual variations in enzyme activities involved in carbon (C), nitrogen (N), phosphorus (P), and sulfur (S) cycling and soil physicochemical properties were examined in a Japanese paddy field. All the enzyme activities determined at the field soil temperature (range, 2.2°C–28.3°C) increased exponentially with soil temperature (p<0.001). Significant negative correlations were found between Bray-2P concentration and the ratio of acid phosphatase to β-D-glucosidase activity (Spearman r = −0.631, p = 0.005) and between total N and the ratio of L-asparaginase to β-D-glucosidase activity (r = −0.612, p=0.007), suggesting that in accordance with the resource allocation model, acid phosphatase and L-asparaginase were synthesized by microorganisms depending on the temporal changes in soil P and N availability. These results suggest the significance of soil temperature in controlling in situ enzyme activities in paddy soil and also that the stoichiometry of enzyme activities associated with C, N, and P acquisition reflects the soil nutrient availability. SN - 1687-7667 UR - https://doi.org/10.1155/2018/4093219 DO - 10.1155/2018/4093219 JF - Applied and Environmental Soil Science PB - Hindawi KW - ER -